A simple way to model high-order feature interactions is to enumerate all feature interactions [1]} as follows:
\(g_t \left( x \right) = \sum _{i_{1}=1}^{m} \sum _{i_{2}=i_{1}+1}^{m} \ldots \sum _{i_{t}=i_{t-1}+1}^{m} \prod _{l=1}^{t} x_{i_{l}},\) 
